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Paper/patches/server/0440-Optimize-Dynamic-get-Missing-Keys.patch
Spottedleaf 8c5b837e05 Rework async chunk api implementation
Firstly, the old methods all routed to the CompletableFuture method.
However, the CF method could not guarantee that if the caller
was off-main that the future would be "completed" on-main. Since
the callback methods used the CF one, this meant that the callback
methods did not guarantee that the callbacks were to be called on
the main thread.

Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb)
so that the methods with the callback are guaranteed to invoke
the callback on the main thread. The CF behavior remains unchanged;
it may still appear to complete on main if invoked off-main.

Secondly, remove the scheduleOnMain invocation in the async
chunk completion. This unnecessarily delays the callback
by 1 tick.

Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which
will load chunks within an area. This method is provided as a helper
as keeping all chunks loaded within an area can be complicated to
implement for plugins (due to the lacking ticket API), and is
already implemented internally anyways.

Fourthly, remove the ticket addition that occured with getChunkAt
and getChunkAtAsync. The ticket addition may delay the unloading
of the chunk unnecessarily. It also fixes a very rare timing bug
where the future/callback would be completed after the chunk
unloads.
2024-11-18 23:00:59 -08:00

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1.8 KiB
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 21 Dec 2020 11:01:42 -0500
Subject: [PATCH] Optimize Dynamic#get Missing Keys
get was calling toString() on every NBT object that was ever asked for an optional
key from the object to build a string for the error text.
When done on large NBT objects, this was using a ton of computation time building the
JSON representation of the NBT object.
Now we will just skip the value when 99.9999% of the time the text is never even printed.
diff --git a/src/main/java/com/mojang/serialization/Dynamic.java b/src/main/java/com/mojang/serialization/Dynamic.java
index d73bb05272d69471644b28f8c704a3bfceca72c2..8b4ea53b891bb7a5ceb791c4afaaf33814d9b6f6 100644
--- a/src/main/java/com/mojang/serialization/Dynamic.java
+++ b/src/main/java/com/mojang/serialization/Dynamic.java
@@ -19,6 +19,7 @@ import java.util.stream.Stream;
@SuppressWarnings("unused")
public class Dynamic<T> extends DynamicLike<T> {
+ private static final boolean DEBUG_MISSING_KEYS = Boolean.getBoolean("Paper.debugDynamicMissingKeys"); // Paper - Perf: Skip toString on values like NBT
private final T value;
public Dynamic(final DynamicOps<T> ops) {
@@ -120,7 +121,7 @@ public class Dynamic<T> extends DynamicLike<T> {
return new OptionalDynamic<>(ops, ops.getMap(value).flatMap(m -> {
final T value = m.get(key);
if (value == null) {
- return DataResult.error(() -> "key missing: " + key + " in " + this.value);
+ return DataResult.error(() -> DEBUG_MISSING_KEYS ? "key missing: " + key + " in " + this.value : "key missing: " + key); // Paper - Perf: Skip toString on values like NBT
}
return DataResult.success(new Dynamic<>(ops, value));
}));